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Aviation History
1956
1956 - 0884.PDF
28 PLIGHT REAR PRESSURE BULKHEAD DIPLOMATIC MAIL LOCKER EMERGENCY EXIT DOOR REAR CABIN (32 SEATS) \ . - THERMAL LEADING EDGE DE-ICING DUCT 1 Search radar. 2 D.M.E. transmitter aerial. 3 D.M.E. homing aerials. 4 A.D.F. loop aerials under fibre-glass fairing. 5 Conditioned air supply grills. i Underside hatch to No. 1 freight hold. 7 Forward discharge valve. 8 Air-conditioning equipment. 9 Over-wing window emergency exits (two each side). 10 Heat exchanger. 11 Rectifiers. 12 Landing light (port and starboard). 13 Fire-extinguisher bottles. 14 Undercarriage servo. 15 Slots in nacelle fillet. 16 Leading-edge ice detection spot light. 17 Pitot tube. 18 Navigation lights. 19 Aileron-operating mechanism. 20 Fuel booster pump. 21 Air brake (upper and lower wing surfaces). 22 Flaps servo. 7;-"-; 23 Fuel vent pipe. 24 Fuel-jettison pipe. 25 Jet-pipe support rails. 26 Dinghy stowage (port and star- board). 27 Cabin air. 28 H.F. Loran aerials. 29 Elevator and rudder servo unit. 30 Rear discharge valve. 31 Tail unit de-icing supply. 32 V.H.F. radio rack. 33 I.L.S./V.O.R. aerial. 34 V.H.F. aerial. No 3 FREIGHT HOLD TOILETS- EACH SIDEPASSENGER ENTRY DOOR No 2 FREIGHT HOLD STUB WING INTEGRAL S BAG TANKS 806 Imp col EACH SIDE 24 MID WING INTEGRAL FUEL TANK 1,408 imp 901 WHEEL BOGIE OUTWARD RETRACTING THERMAL LEADING EDGE DE-ICING DUCT INTEGRAL OUTER WING TANK 780 Imp gal EACH SIDE NACELLE FUEL TANK imp go! EACH SIDE tively house and separate the majority of the equipment associated withthe aircraft electrics and hydraulics. Generous provision is made for maintenance and servicing.The wing is of cantilever construction comprising a centre-section, two stub wings, and two extension wings. The centre-section is a two-spar structure and is an integral part of the fuselage, incorporating attachments for the stub wings. The centre-section is not pressurized andaccommodates four flexible fuel tanks. The stub wings are also two-spar structures and carry the engines and the main undercarriage, integral andflexible fuel tanks, and de-icing leading edge ducts. Engine bays are separated by titanium bulkheads. The stub wings also carry part of theflaps, which are of the split type underneath the engines and of the plain type outboard, and the airbrakes. The extension wings are attached to the stub wings by fore and aftbolts extending between the spars. The extension wings carry the ailerons and the outboard section of the flaps, the integral fuel tanks,nacelle-type fuel tanks and de-icing ducts. The fin and tailplane are of conventional construction. The main undercarriage gear, of de Havilland design, consists of two four-wheelassemblies, and a two-wheel steerable nose-gear. Retraction, steer- ing and braking are hydraulic. The main gear shock absorbers areoleo-pneumatic struts operating from both beams of the bogie and with a trimmer damping strut operating from the rear beam. The nose under-carriage incorporates a single oleo-pneumatic shock strut. The doors of the main undercarriage are operated hydraulically and are arrangedto be shut when the undercarriage is extended. The doors of the nose- wheel are opened and closed mechanically. A good point is that allwheel doors are positively locked up mechanically. The wheel brakes are Dunlop disc units incorporating the Maxaret anti-skid device. Thenosewheel is self-centring with a steering range of 59 deg on either side of neutral; steering can be unlocked to permit the nosewheel to turnthrough 360 deg for towing. A tail bumper beneath the tail protects the structure in the event of a tail-down landing. POWERPLANT. The Comet 4 is powered by four Rolls RoyceAvon RA.29 jet engines of 10,500 lb thrust each. They are mounted between the front and the rear main spars of each stub wing, insulated
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